Help with STC-2C-BO Wiring

[Kimbro]

Hello - hoping someone can help me diagnose my wiring issue. I've built a custom bass with 3 pickups - a Hofner style in the neck position, P-Bass style in the middle and a Music Man style in the bridge position along with the STC-2C-BO pre-amp. The neck and middle pickup volumes are only active when the bridge pickup's volume is up so they are not acting as independent volume controls which is what I'm attempting to achieve.
Please see attached picture of how I have it wired. Thanks!!!

 

[Kimbro]

Re: Help with STC-2C-BO Wiring

So I got this figured out and wanted to post in case anyone else was wondering - it's actually fairly simple: Jazz bass style pickup wiring is done in parallel so that all the volume controls act independently. The MusicMan style pickup in the bridge in the pic above is wired in series. Switching the black wire with the white wire switches it to parallel, solving the issue.